API object authorization concept with user, object ID, and lock

API BOLA Explained with Realistic Examples

BOLA happens when an API exposes object identifiers but fails to verify whether the caller is allowed to access the object.

July 8, 2026 · 7 min · KevinSec
API authentication flow with client token and backend verification

API Broken Authentication: Common Testing Patterns

API broken authentication appears when an API cannot reliably prove who the caller is or cannot safely manage credentials, tokens, and sessions.

July 8, 2026 · 7 min · KevinSec
JSON Web Token security concept with token and lock

JWT Security Testing Checklist

JWTs are compact signed tokens, but implementation mistakes can turn them into authentication and authorization weaknesses.

July 8, 2026 · 6 min · KevinSec
API request traffic passing through a rate limiting control

Rate Limiting: The Control That Many Apps Forget

Rate limiting is not only a performance control. It is a security boundary for authentication, abuse prevention, and API resource protection.

July 8, 2026 · 5 min · KevinSec